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17
Protecting Your Virtual Disk With A Hot
Spare
When you create a virtual disk using a RAID controller, it enables the system to continue functioning even
during a disk failure. This feature can be enabled by assigning a hot spare to the virtual disk. When a disk
fails, the redundant data is rebuilt onto the hot spare without interrupting system operations.
Related Links
Dedicated Hot Spare Considerations
Dedicated Hot Spare Protection Policy
Understanding Hot Spares
A hot spare is an unused backup physical disk that can be used to rebuild data from a redundant virtual
disk. Hot spares remain in standby mode. When a physical disk that is used in a redundant virtual disk fails,
the assigned hot spare is activated to replace the failed physical disk without interrupting the system or
requiring your intervention. If a virtual disk using the failed physical disk is not redundant, then the data is
permanently lost without any method (unless you have a backup) to restore the data.
Hot spare implementation varies for each controller controller. For more information on hot spares, see:
• Considerations For Hot Spares On PERC S100 And PERC S300 Controllers
• Global Hot Spare Considerations On A SAS 6/iR
The following sections describe procedures for assigning a hot spare:
• Assigning And Unassigning Global Hot Spare
• Assigning And Unassigning Dedicated Hot Spare
Setting Hot Spare Protection Policy
The Hot Spare Protection Policy is supported only on Serial Attached SCSI (SAS) controllers.
The Hot Spare Protection Policy provides you with a higher protection level for the virtual disks by
enabling you to specify the number of dedicated/global hot spares to be assigned to the virtual disks/
controller. You can also specify the severity levels for the protection policy. Storage Management sends
alerts when the hot spare protection policy is violated.
Storage Management does not provide a default policy; however, you can determine the hot spare
protection policy best suited for your environment.
Related Links
Assigning And Unassigning Dedicated Hot Spare
Assigning And Unassigning Global Hot Spare
183
- Notes, Cautions, and Warnings 2
- Copyright 2
- Contents 3
- Overview 15
- Supported Controllers 16
- Supported Enclosures 17
- Getting Started 19
- User Privileges 20
- Displaying The Online Help 21
- Common Storage Tasks 21
- Understanding RAID Concepts 23
- Performance 24
- Concatenation 25
- RAID Level 0 (Striping) 26
- RAID Level 1 (Mirroring) 27
- Storage Health 35
- Hot Spare Protection Policy 35
- Storage Component Severity 36
- Alerts Or Events 37
- What Is PCIe SSD? 39
- PCIe SSD Features 39
- PCIe SSD SubSystem Properties 39
- PCIe Extender Cards 40
- Physical Device Properties 41
- Physical Device Tasks 43
- Exporting The Log 44
- PCIe SSD 45
- PCIe SSD SubSystem Health 47
- Fluid Cache Disks 50
- Fluid Cache Pool 51
- Cache I/O Statistics 53
- License Settings 54
- Storage Properties 57
- Global Tasks 57
- Storage Controller Properties 58
- RAID Controller Features 62
- Read Policy 63
- Write Policy 63
- Cache Policy 64
- Disk Cache Policy 64
- Non-RAID SCSI Controllers 65
- Non-RAID SAS Controllers 65
- Firmware Or Driver Versions 66
- Controller Health 67
- Controller Tasks 71
- Rescanning The Controller 72
- Creating A Virtual Disk 72
- Enabling The Controller Alarm 72
- Testing The Controller Alarm 73
- Setting The Rebuild Rate 73
- Setting The Reconstruct Rate 84
- Setting The Patrol Read Mode 86
- To Set The Patrol Read Mode 87
- Managing The Preserved Cache 91
- Encryption Key 92
- Managing The Encryption Key 93
- Converting To Non-RAID Disks 94
- Viewing Available Reports 95
- Viewing Slot Occupancy Report 96
- 9 Hardware Controller 99
- Enclosures And Backplanes 103
- SMART Thermal Shutdown 104
- Enclosure Physical Disks 104
- Enclosure Fans 104
- Enclosure Power Supplies 105
- Enclosure Temperature Probes 106
- EMM Properties 109
- Enclosure And Backplane Tasks 112
- Enabling The Enclosure Alarm 113
- Setting Asset Data 113
- Enclosure — Available Tasks 113
- Available Reports 115
- View Slot Occupancy Report 115
- Enclosure Management 116
- Enclosure Components 117
- Connectors 119
- Connector Health 120
- Rescanning The Connector 121
- Path Health 123
- Connector Components 123
- Tape Drive 125
- RAID Controller Batteries 127
- Battery Tasks 128
- Battery — Available Tasks 128
- Delay The Battery Learn Cycle 129
- For SAS Controllers 132
- Other Disk Procedures 133
- Physical Disk Tasks 138
- Removing Dead Segments 139
- Preparing To Remove 139
- Rebuilding Data 139
- Canceling A Rebuild 140
- Enabling Revertible Hot Spare 142
- Convert To RAID Capable Disk 143
- Convert To Non-RAID Disk 143
- Virtual Disks 145
- Creating Virtual Disks 148
- Virtual Disk Properties 153
- Virtual Disk Tasks 156
- Reconfiguring A Virtual Disk 157
- Restoring Dead Segments 157
- Replacing A Member Disk 159
- Encrypting A Virtual Disk 159
- Span Edit 168
- Slow And Fast Initialize 172
- Deleting A Virtual Disk 173
- Renaming A Virtual Disk 174
- Split Mirror 175
- Unmirror 176
- One System To Another 181
- Understanding Hot Spares 183
- S300 Controllers 186
- Managing The CacheCade 189
- CacheCade Properties 190
- Creating A CacheCade 190
- Resizing The CacheCade 191
- Renaming The CacheCade 191
- Deleting The CacheCade 191
- Troubleshooting 193
- Drivers And Firmware 194
- Isolate Hardware Problems 194
- Replacing A Failed Disk 194
- Replacing The Disk 195
- Assigning A Hot Spare 195
- Virtual Disk Troubleshooting 196
- Cannot Create A Virtual Disk 197
- Is Degraded 199
- PCIe SSD Troubleshooting 201
- Fluid Cache For DAS 202
- Frequently Asked Questions 205
- Which Controllers Do I Have? 206
- How Do I Turn Off An Alarm 206
- Concatenation Performance 207
- Supported Features 209
- Controllers 217
- H200 Controllers 233
- S110, And S300 Controllers 242
- Storage Components 249
- Not Included) 251
- Power Connection Removed 252
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